在RuO2纳米棒上定碳促进的Pt单个原子,以促进电化学进化
Jing-Fang Huang1, Wen-Jun Hsieh1, Jeng-Lung Chen2
1A Department of Chemistry, National Chung Hsing University, Taichung 402, Taiwan (R.O.C).
ACS applied materials & interfaces
|May 17, 2024
概括
这项研究在二氧化纳米棒上引入了新的单原子催化剂,显著提高了进化反应效率. 这些催化剂在低负载下保持最佳路径,克服金.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- (Pt) 是电化学演化反应 (HER) 的高效催化剂,但其高成本和稀缺性限制了广泛的应用.
- 传统的Pt催化剂和单原子Pt催化剂 (Pt-SACs) 在非常低的Pt度下,难以保持有效的HER通路,特别是Volmer-Tafel机制.
研究的目的:
- 开发一种新的Pt-SAC催化剂,克服进化反应传统催化剂的局限性.
- 为了实现高的Pt利用效率,并在超低的Pt负载下保持动力学上有利的HER路径.
主要方法:
- 碳促进的单原子 (aPt) 催化剂被合成并沉积在在碳 (aPt/RuO2NR/Carbon) 上支的二氧化 (RuO2) 纳米棒上,而不使用减少剂.
- 对于HER,合成的aPt/RuO2NR/碳催化剂的电化学性能被评估,包括开端超电位,质量活性和周转频率.
- 在超低Pt负载下分析了HER通路和Pt利用效率.
主要成果:
- aPt/RuO2NR/碳催化剂显示了增强的HER活性,其中包括促进了"inter-aPts"的Tafel相互作用.
- 这种Pt-SAC保留了低潜能沉积的气,并表现出对HER的负开端过度潜能.
- 与商业Pt/C相比,aPt/RuO2NR/Carbon在Pt质量活动 (522.7 A mg-1) 和周转频率 (528.4 s-1) 中增加了260倍.
- 在0.19μg cm-2的超低Pt负载下,HER保持了Volmer-Tafel机制,实现了100.3%的Pt利用效率.
结论:
- 开发的碳促进的aPt/RuO2NR/碳催化剂代表了HER催化学的重大进步,提供了卓越的性能和效率.
- 这种催化剂设计有效地解决了低Pt负载和成本的挑战,为更经济的生产铺平了道路.
- 在超低负载下保持最佳HER通路和高Pt利用的能力突显了这种材料在实际应用中的潜力.
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